"Where do I add the new oil?
Take a look at the photo below of the breather cover.
Turn the breather cover counter-clockwise to remove it.
Remove the filter then add oil.
"Where is the transmission drain and fill?"
Take a look at the photo below of the transmission plugs.
You might need to move the drawbar out of the way to access the drain plug underneath.
Take a look at a photo of the rear drain plug.
When adding transmission oil, fill to the bottom of the threads of the filler hole.
The operator's manual recommends 4 1/2 gallons.
Hope this helps.